Improvement in steps for mill-spindles



D. HARRINGTON. Step. for Mill-Spindles.

No. 208,733. Patented Oct. 8, 1878.,

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UNITED STATES PATENT OEEIGEo DANIEL HARRINGTON, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN STEPS FOR MILL-SPINDLES.V

Specilication forming part of Letters Patent No. 208,733, dated October $1, 1R78; application iilcd April 12, 1878.

To all 'whom it may concern.-

Be it known that I, DANIEL HARRINGTON, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tram-Pots or Step-Bearings for Mill-spindles or Upright Shafts, of which the following is a true and accurate description.

The nature of my invention relates to the construction and arrangement of tram-pots or step-bearings for the foot ends of mill-spindles or upright shafts; and it consists in a certain combination of a ring-bearing and a loose steel button, for guiding and carrying the spindle or upright-shaft point, with an anti-friction lining, for guiding the turned and polished mill spindle or shaft end, for the purpose of increasing the lateral and vertical bearing-surface, so as to reduce the wear and tear and to prevent the parts from becoming heated by friction.

It also consists in a series of lubricatingchannels arranged within the tram-pot, which will facilitate the communication of the oil with all of the bearing-surfaces, and through them the free circulation of the same.

In the drawing, Figure l represents a vertical longitudinal section through the trampot and spindle-point, and Fig. 2 represents a sectional plan of the same on line x A is the bed-plate, which is to be secured upon the spindle-beam by four bolts, a a a a. It has a round opening in its middle, and is provided on its cornersvwith four lugs, b, having screw-tapped holes7 for holding the setserews B. C is the oil-pot guide, consisting of a ring or sleeve, which projects into the central opening of bed-"plate A, and which is internally bored out cylindrically, and has flanges resting upon the bed-plate A, to be adjustably secured upon it by two bolts, c. It also has bosses o', to meet the points of the set-screws B, by which said guide is laterally adjusted. D is the oil-pot, which is a cylindrical box, with a solid bottom and ri ght-angularly expanded iianges on its upper end. This is turned exteriorly cylindrical to make a close fit with the bore of guide C, so as to slide up and down therein, and is held from rotating by a vertical groove cut in its face and by a screw-point tapped through the shell of the guide. It is supported by a pointed pin, L, arranged for a vertical adjustment in the usual manner. rIhe interior of this oilpot D is bored ont concentric with its exterior surface, to hold in its bottom the steel tramplate E, and upon this a steel ring, F, both held from turning by a key, f; and into the upper portion of said oil-cup is secured a ringlining, G, of anti-friction metal, also held from turning by a key, g. H is part of the millspindle, the lower end of which is turned truly cylindrical, and of a size to make a close fit with the interior surface of the lining, and is highly polished; and I is the spindle-point, made of tempered steel, which is inserted into a conical socket in the mill-spindle end, and the lower end of which fits snugly into ring F.

One or more steel buttons, i, is interposed between the tram-plate and spindle-point, which is of such diameter that it will pass inside of ring F, being laterally held in position therein, but is allowed to turn upon the tramplate.

Lubricating-channels m and n are cut into the exterior faces of the lining G and ring F, so that the oil can freely circulate to and communicate with the several bearing-surfaces.

Heretofore tram-pots have been constructed either with a lateral bearing onlyT forthe spindie-point in a ring, F, or with a ring-1ining, G, only for the lower part of the spindle, and without button i. In either case the tramplate and spindle-point were apt to heat to a melting condition, and would require therefore constant attention, while their wear and tear were very great.

Vith my above-described arrangement of lining Gr, as a lateral bearing for the mill-spindle, in combination with ring F, as a similar bearing for the spindle-point, I enlarge the lateral bearing-surface considerably and hold the foot end of the spindle very steady, while the steel button fi, held in place by ring F, but allowed to rotate therein, will carry the weight of the spindle and running stone, and will multiply the pivoting-surfaces, thereby reducing the friction and the danger of heating.

What I claim :is my invention ising' ofthe trani-pot, G, having oil-pot D, fram` 1. In combination with the mill-spindle H, plate E, ring F, lining G, Steel button i, and having point I, a, tram-pot having oil-pot 1), luhricati11g-channels m 11 all constructed and with tram-plate E, ring,` I", lining and stoel arranged substnntiallyais described andshown.

button i, all constructed mld arrangod suh- DANIEL HARRINGTON. stantially in the, manner and for the purpose \`\'tnesses: set forth. WM. I I. LoTz,

:3. A stepbcnring' for mil1spindlos, consist EMIL 1I. FROMMANN. 

